Seamless Steel pipe grades and specifications
| Descriptions | Grades |
| Structural pipe | 20# 35# 45# Q345B, 16Mn, Q345B-E, 20Mn2, 25Mn, 30Mn2, 40Mn2, 45Mn2, SAE1018, SAE1020, SAE1518, SAE1045. |
| Liquid pipe | 20# q295b-e, q345b-e |
| High pressure boiler tube | 20G 15MnG 20MnG 15CrMoG, 12Cr1MoVG, St35.8, sa106b, sa106c, sa210a, sa210c, A333P2, A333P11, A33P12, A333P22, A33P36, A333P91, A333P92, A335T2, A335T11, A335T12, A335T22, A335T91, A335T23, A335T9 |
| Pipeline | API SPEC 5L, X42, X52, X60, X65,X70,X80, ASTMA53, ASTM A106, ASTM A333, BS301, BS3602, BS3603, BS3604, PSL1, PSL2, DNV-OS-F101, CSA-Z245 |
| Alloy pipe | 4140, 42CrMo, 32CrMo, 15CrMo, |
| Packing | Black paint, Varnish painting, Tarpaulin packing |
| End | Common round end, beveled. |
| Processing | Galvanizing; cutting; making thread outside the pipe; Machining. |
| outer diameter | hot rolled 32-630mm; cold drawn 5-200mm |
| wall thickness | hot rolled 2.5-75mm; cold drawn 2.5-12mm |
Seamless pipes grades and production methods
1. Round bar making Hollow Bar
according to customer's demanded material to produce the round bar, then making annealled heat treatment,
then drill the hole as customer demanded inner diameter into the round bar, round bar piercing, making rough
hole, then make precision processing to make outer diameter and inner diameter as requested.
Any size hollowbar can be produced as demanded.
2. Hot rolled Hollow Bar
using hot rolled steel pipe billet to make heating and piercing, elongating, sizing and stranghtening, cooling, finally
hollow bars finished, this is the type most commonly used. Because it is hot rolled, so cost is lowest, but it is suit
for large quantity, for small quantity, have to make cold drawn or round bar piercing.
size: outer diameter 32mm- 499mm, wall thickness 4mm- 80mm
3. Cold drawn Hollow Bar
for outer diameter not over than 63.5mm, small size hollow bar, when demanded quantity is under 5 tons, usually
make cold drawn hollow bar, using larger size hot rolled hollow bar to draw to the size demanded.
some size can be finished only by one time drawing, but some other sizes might need twice or three times to finish
drawing, it takes time, so the cost is higher.
cold drawn size outer diameter 32mm- 63.5mm
4. Hot- expanding Hollow Bar
For hollow bar sizes are special, not common sizes, have to use smaller thick wall hollow bar to hot expand to be
larger size hollow bar, but the technical property for hot-expanded hollow bar will be lower than the original hollow
bar. Size: outer diameter over 356mm.
Steel pipes containers loading
Steel pipes bulk vessel packing and loading
Seamless pipes processing and fabrication
seamless pipe can do painting,cutting and bending, can process according to customers' needs.
Steel pipes stock detail
galvanzied steel pipe,square tube,rectangular steel pipe,erw pipe,spiral pipe,seamless pipe etc,all have stock in factory.
Company introduction:
Tianjin Emerson Commercial and Trade co., Ltd located in Tianjin the largest seaport in north of China, has more than 10 years
of experience in Iron and Steel materials, has large stock for steel raw materials.
Factory stock product list: EXW steel pipe, spiral welded steel pipe, seamless steel pipe, hollow bar, galvanized round pipe,
galvanized square pipe, square steel pipe, rectangular steel pipe, carbon steel pipe, alloy steel pipe, stainless steel pipe etc.
Our company also provide cutting, bending, welding, cnc machining etc service, can do customized processing according to demands.
Good Quality! Fast Delivery Time! Good After-Sale Service!
Looking forward to your kind contact